| 摘要 |
1. A mining electric supply cable which contains individually screened, plastic insulated working copper conductors, a filler coating and a plastic tube. The cable is distinctive in that the working insulation (2) of each of the working conductors (1) is wrapped in an non-metallic screen (3) made from one layer of a conductive strip while a metallic screen (4) is built from two layers of a copper strip; the conductive strip of the non-metallic screen (3) is wound spirally in such a way that each coil overlaps the next one by at least 30% of its width, while the lower part of the screen (4) is wound in such a way that clearances are left, their width being 50% of the strip's width; the clearances are covered with the other layer of the copper strip that overlaps as well the coils of the lower layer by 25% of their width; there is also a bare copper wire (5) placed centrally to the working conductors (1).2. A mining electric supply cable which contains individually screened, plastic insulated working copper conductors, a filler coating and a plastic tube. The cable is distinctive in that the working insulation (2) of each of the working conductors (1) is wrapped in metallic screen (3) of two equally wide layers of copper strip in such a way that the lower layer is wound with clearances and the coils of the upper layer overlap the lower ones by at least 10 mm; there is also a bare copper wire (5) placed centrally to the working conductors (1).<IMAGE>
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